Ten real Morse telegraph keys and related instruments shown with verified Wikimedia Commons photographs: early Morse telegraph, museum keys, key-and-sounder sets, relay, and transmitter. Photograph credits: 1. File:Morse Telegraph 1837.jpg; (c) 2006 Zubro; CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Morse_Telegraph_1837.jpg; 2. File:Morse key n jacobsen mekaniske verksted 1935 IMG 3774 telenor bergen.jpg; Bjoertvedt; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Morse_key_n_jacobsen_mekaniske_verksted_1935_IMG_3774_telenor_bergen.jpg; 3. File:Old telegraph instruments morse key and morse sounder.JPG; Kannan shanmugam ,Shanmugam studio, Kollam; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Old_telegraph_instruments_morse_key_and_morse_sounder.JPG; 4. File:Morse key and soounder at MIT flea.agr.jpg; ArnoldReinhold; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Morse_key_and_soounder_at_MIT_flea.agr.jpg; 5. File:Morsetaste.jpg; Hp.Baumeler; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Morsetaste.jpg; 6. File:Morse key-CNAM 14674-2-IMG 5195-black.jpg; Rama; CC BY-SA 3.0 fr; https://creativecommons.org/licenses/by-sa/3.0/fr/deed.en; https://commons.wikimedia.org/wiki/File:Morse_key-CNAM_14674-2-IMG_5195-black.jpg; 7. File:Wright Telegraph Key.jpg; Sanjay Acharya; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Wright_Telegraph_Key.jpg; 8. File:Telegraph Key & Relay - Victorian Telegraph Service, 1860s.jpg; Museums Victoria; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:Telegraph_Key_&_Relay_-_Victorian_Telegraph_Service,_1860s.jpg; 9. File:Morse Key.jpg; Lauren.mcalary; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Morse_Key.jpg; 10. File:Morse Code Transmitter.jpg; Yoram Shoval; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Morse_Code_Transmitter.jpg;